Improvement in sewing-machines



A. D. HOPKINS.

-M ch'nes.- N0. 132 olsnwrovement In Sewing fiPatlented Oct. 8! 1872 Invuutur \Vitli *sses v. 7 ZO7A M J UNITED STATES PATENT OFFICE.

ABEDNEGO D. HOPKINS, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 132,081, dated October 8, 1872.

To all whom it may concern: 7

Be it known that I, ABEDNEGO D. Horms, of San Francisco city and county, State of California, have invented Improvements in Sewing-Machines; and I do hereby declare the following description and accompanying drawing are sufficient to enable any person skilled in the art or science to which it most nearly appertains to make and use my said invention or improvements Without further invention or experiment.

The object of my invention is to provide an improvement in sewing-machines; and it relates more particularly to the devices by which the lock-stitch is formed.

The present invention consists in operating a needle-bar by a crank or eccentric connected to a piston or slide which works through an oscillating gudgeon, one end of such piston or slide being connected to the crank or eccentric, and the other end to a vibrating link attached to the needle-lever. One end of the needlelever is attached to a fixed fulcrum, and the other gives motion to the needle. The piston or slide, which is driven by the crank or eccentric,passes through the oscillating gudgeon or slide. The latter acts as a lever with a movable fulcrum, and is connected with the vibrating link attached to the needle-lever. The combination of these arrangements gives the required irregularity to the motion of the needle and renders the machine powerful, comparatively noiseless, and easy for the operator, and not liable to derangement.

Referring to the accompanying drawing, Figure 1 is a side elevation of my device.

My present invention consists in obtaining the results which are produced by the agency of the cam movement by a peculiar combination of mechanism, actuated by a rotating shaft, and whereby the irregular motion necessary to enable the lock-stitch to be formed with the ordinary shuttle is imparted to the needle-bar.

At one end of a revolving shaft, A, is fixed a .crank-pin or'eccentric, B, to which is attached a piston or lever, O, which passes through an oscillating gudgeon or slide, D, fixed at a convenient point from the crank or eccentric, thus forming a lever with a movable fulcrum. One end of the piston or lever is attached to a radius or vibrating link, E, by means of a pin, F, passing through a joint, the opposite end being in like manner attached to the ordinary needle-lever G at a convenient point from the fulcrum H of the latter. This last-mentioned attachment may be made on either side of the fulcrum, as may be best adapted to the nature and construction of the machine.

When the combination of the mechanism before described is set in motion by the revolving shaft, which may be actuated in any suitable manner, the needle secured to the bar I is caused to descend through the material to be operated upon, and then to rise and form the loop. The needle is then, by the action of the mechanism, allowed to rest, while the shut tle passes through the loop, and finally rises, the remainder of the stroke thus completely making the lock-stitch by one revolution of the rotating shaft.

' Having thus described my invention, What I claim, and desire to secure by Letters Patent, is-

The combination and arrangement of parts and mechanism of the crank B and eccentric piston or lever O with the oscillating gudgeon or slide D, through which it works, the radius or vibrating link E, and needle-lever G, substantfally as and for the purpose described.

In witness whereof I hereunto set my hand and seal.

ABEDNEGO DAVID HOPKINS. [L. 8.]

Witnesses:

J. L. BOONE, G. M. RICHARDSON. 

